/*!
 * # Semantic UI 2.4.1 - Popup
 * http://github.com/semantic-org/semantic-ui/
 *
 *
 * Released under the MIT license
 * http://opensource.org/licenses/MIT
 *
 */

;(function ($, window, document, undefined) {

    'use strict';

    window = (typeof window != 'undefined' && window.Math == Math)
        ? window
        : (typeof self != 'undefined' && self.Math == Math)
            ? self
            : Function('return this')()
    ;

    $.fn.popup = function (parameters) {
        var
            $allModules = $(this),
            $document = $(document),
            $window = $(window),
            $body = $('body'),

            moduleSelector = $allModules.selector || '',

            hasTouch = (true),
            time = new Date().getTime(),
            performance = [],

            query = arguments[0],
            methodInvoked = (typeof query == 'string'),
            queryArguments = [].slice.call(arguments, 1),

            returnedValue
        ;
        $allModules
            .each(function () {
                var
                    settings = ($.isPlainObject(parameters))
                        ? $.extend(true, {}, $.fn.popup.settings, parameters)
                        : $.extend({}, $.fn.popup.settings),

                    selector = settings.selector,
                    className = settings.className,
                    error = settings.error,
                    metadata = settings.metadata,
                    namespace = settings.namespace,

                    eventNamespace = '.' + settings.namespace,
                    moduleNamespace = 'module-' + namespace,

                    $module = $(this),
                    $context = $(settings.context),
                    $scrollContext = $(settings.scrollContext),
                    $boundary = $(settings.boundary),
                    $target = (settings.target)
                        ? $(settings.target)
                        : $module,

                    $popup,
                    $offsetParent,

                    searchDepth = 0,
                    triedPositions = false,
                    openedWithTouch = false,

                    element = this,
                    instance = $module.data(moduleNamespace),

                    documentObserver,
                    elementNamespace,
                    id,
                    module
                ;

                module = {

                    // binds events
                    initialize: function () {
                        module.debug('Initializing', $module);
                        module.createID();
                        module.bind.events();
                        if (!module.exists() && settings.preserve) {
                            module.create();
                        }
                        if (settings.observeChanges) {
                            module.observeChanges();
                        }
                        module.instantiate();
                    },

                    instantiate: function () {
                        module.verbose('Storing instance', module);
                        instance = module;
                        $module
                            .data(moduleNamespace, instance)
                        ;
                    },

                    observeChanges: function () {
                        if ('MutationObserver' in window) {
                            documentObserver = new MutationObserver(module.event.documentChanged);
                            documentObserver.observe(document, {
                                childList: true,
                                subtree: true
                            });
                            module.debug('Setting up mutation observer', documentObserver);
                        }
                    },

                    refresh: function () {
                        if (settings.popup) {
                            $popup = $(settings.popup).eq(0);
                        }
                        else {
                            if (settings.inline) {
                                $popup = $target.nextAll(selector.popup).eq(0);
                                settings.popup = $popup;
                            }
                        }
                        if (settings.popup) {
                            $popup.addClass(className.loading);
                            $offsetParent = module.get.offsetParent();
                            $popup.removeClass(className.loading);
                            if (settings.movePopup && module.has.popup() && module.get.offsetParent($popup)[0] !== $offsetParent[0]) {
                                module.debug('Moving popup to the same offset parent as target');
                                $popup
                                    .detach()
                                    .appendTo($offsetParent)
                                ;
                            }
                        }
                        else {
                            $offsetParent = (settings.inline)
                                ? module.get.offsetParent($target)
                                : module.has.popup()
                                    ? module.get.offsetParent($popup)
                                    : $body
                            ;
                        }
                        if ($offsetParent.is('html') && $offsetParent[0] !== $body[0]) {
                            module.debug('Setting page as offset parent');
                            $offsetParent = $body;
                        }
                        if (module.get.variation()) {
                            module.set.variation();
                        }
                    },

                    reposition: function () {
                        module.refresh();
                        module.set.position();
                    },

                    destroy: function () {
                        module.debug('Destroying previous module');
                        if (documentObserver) {
                            documentObserver.disconnect();
                        }
                        // remove element only if was created dynamically
                        if ($popup && !settings.preserve) {
                            module.removePopup();
                        }
                        // clear all timeouts
                        clearTimeout(module.hideTimer);
                        clearTimeout(module.showTimer);
                        // remove events
                        module.unbind.close();
                        module.unbind.events();
                        $module
                            .removeData(moduleNamespace)
                        ;
                    },

                    event: {
                        start: function (event) {
                            var
                                delay = ($.isPlainObject(settings.delay))
                                    ? settings.delay.show
                                    : settings.delay
                            ;
                            clearTimeout(module.hideTimer);
                            if (!openedWithTouch) {
                                module.showTimer = setTimeout(module.show, delay);
                            }
                        },
                        end: function () {
                            var
                                delay = ($.isPlainObject(settings.delay))
                                    ? settings.delay.hide
                                    : settings.delay
                            ;
                            clearTimeout(module.showTimer);
                            module.hideTimer = setTimeout(module.hide, delay);
                        },
                        touchstart: function (event) {
                            openedWithTouch = true;
                            module.show();
                        },
                        resize: function () {
                            if (module.is.visible()) {
                                module.set.position();
                            }
                        },
                        documentChanged: function (mutations) {
                            [].forEach.call(mutations, function (mutation) {
                                if (mutation.removedNodes) {
                                    [].forEach.call(mutation.removedNodes, function (node) {
                                        if (node == element || $(node).find(element).length > 0) {
                                            module.debug('Element removed from DOM, tearing down events');
                                            module.destroy();
                                        }
                                    });
                                }
                            });
                        },
                        hideGracefully: function (event) {
                            var
                                $target = $(event.target),
                                isInDOM = $.contains(document.documentElement, event.target),
                                inPopup = ($target.closest(selector.popup).length > 0)
                            ;
                            // don't close on clicks inside popup
                            if (event && !inPopup && isInDOM) {
                                module.debug('Click occurred outside popup hiding popup');
                                module.hide();
                            }
                            else {
                                module.debug('Click was inside popup, keeping popup open');
                            }
                        }
                    },

                    // generates popup html from metadata
                    create: function () {
                        var
                            html = module.get.html(),
                            title = module.get.title(),
                            content = module.get.content()
                        ;

                        if (html || content || title) {
                            module.debug('Creating pop-up html');
                            if (!html) {
                                html = settings.templates.popup({
                                    title: title,
                                    content: content
                                });
                            }
                            $popup = $('<div/>')
                                .addClass(className.popup)
                                .data(metadata.activator, $module)
                                .html(html)
                            ;
                            if (settings.inline) {
                                module.verbose('Inserting popup element inline', $popup);
                                $popup
                                    .insertAfter($module)
                                ;
                            }
                            else {
                                module.verbose('Appending popup element to body', $popup);
                                $popup
                                    .appendTo($context)
                                ;
                            }
                            module.refresh();
                            module.set.variation();

                            if (settings.hoverable) {
                                module.bind.popup();
                            }
                            settings.onCreate.call($popup, element);
                        }
                        else if ($target.next(selector.popup).length !== 0) {
                            module.verbose('Pre-existing popup found');
                            settings.inline = true;
                            settings.popup = $target.next(selector.popup).data(metadata.activator, $module);
                            module.refresh();
                            if (settings.hoverable) {
                                module.bind.popup();
                            }
                        }
                        else if (settings.popup) {
                            $(settings.popup).data(metadata.activator, $module);
                            module.verbose('Used popup specified in settings');
                            module.refresh();
                            if (settings.hoverable) {
                                module.bind.popup();
                            }
                        }
                        else {
                            module.debug('No content specified skipping display', element);
                        }
                    },

                    createID: function () {
                        id = (Math.random().toString(16) + '000000000').substr(2, 8);
                        elementNamespace = '.' + id;
                        module.verbose('Creating unique id for element', id);
                    },

                    // determines popup state
                    toggle: function () {
                        module.debug('Toggling pop-up');
                        if (module.is.hidden()) {
                            module.debug('Popup is hidden, showing pop-up');
                            module.unbind.close();
                            module.show();
                        }
                        else {
                            module.debug('Popup is visible, hiding pop-up');
                            module.hide();
                        }
                    },

                    show: function (callback) {
                        callback = callback || function () {
                        };
                        module.debug('Showing pop-up', settings.transition);
                        if (module.is.hidden() && !(module.is.active() && module.is.dropdown())) {
                            if (!module.exists()) {
                                module.create();
                            }
                            if (settings.onShow.call($popup, element) === false) {
                                module.debug('onShow callback returned false, cancelling popup animation');
                                return;
                            }
                            else if (!settings.preserve && !settings.popup) {
                                module.refresh();
                            }
                            if ($popup && module.set.position()) {
                                module.save.conditions();
                                if (settings.exclusive) {
                                    module.hideAll();
                                }
                                module.animate.show(callback);
                            }
                        }
                    },


                    hide: function (callback) {
                        callback = callback || function () {
                        };
                        if (module.is.visible() || module.is.animating()) {
                            if (settings.onHide.call($popup, element) === false) {
                                module.debug('onHide callback returned false, cancelling popup animation');
                                return;
                            }
                            module.remove.visible();
                            module.unbind.close();
                            module.restore.conditions();
                            module.animate.hide(callback);
                        }
                    },

                    hideAll: function () {
                        $(selector.popup)
                            .filter('.' + className.popupVisible)
                            .each(function () {
                                $(this)
                                    .data(metadata.activator)
                                    .popup('hide')
                                ;
                            })
                        ;
                    },
                    exists: function () {
                        if (!$popup) {
                            return false;
                        }
                        if (settings.inline || settings.popup) {
                            return (module.has.popup());
                        }
                        else {
                            return ($popup.closest($context).length >= 1)
                                ? true
                                : false
                                ;
                        }
                    },

                    removePopup: function () {
                        if (module.has.popup() && !settings.popup) {
                            module.debug('Removing popup', $popup);
                            $popup.remove();
                            $popup = undefined;
                            settings.onRemove.call($popup, element);
                        }
                    },

                    save: {
                        conditions: function () {
                            module.cache = {
                                title: $module.attr('title')
                            };
                            if (module.cache.title) {
                                $module.removeAttr('title');
                            }
                            module.verbose('Saving original attributes', module.cache.title);
                        }
                    },
                    restore: {
                        conditions: function () {
                            if (module.cache && module.cache.title) {
                                $module.attr('title', module.cache.title);
                                module.verbose('Restoring original attributes', module.cache.title);
                            }
                            return true;
                        }
                    },
                    supports: {
                        svg: function () {
                            return (typeof SVGGraphicsElement === 'undefined');
                        }
                    },
                    animate: {
                        show: function (callback) {
                            callback = $.isFunction(callback) ? callback : function () {
                            };
                            if (settings.transition && $.fn.transition !== undefined && $module.transition('is supported')) {
                                module.set.visible();
                                $popup
                                    .transition({
                                        animation: settings.transition + ' in',
                                        queue: false,
                                        debug: settings.debug,
                                        verbose: settings.verbose,
                                        duration: settings.duration,
                                        onComplete: function () {
                                            module.bind.close();
                                            callback.call($popup, element);
                                            settings.onVisible.call($popup, element);
                                        }
                                    })
                                ;
                            }
                            else {
                                module.error(error.noTransition);
                            }
                        },
                        hide: function (callback) {
                            callback = $.isFunction(callback) ? callback : function () {
                            };
                            module.debug('Hiding pop-up');
                            if (settings.onHide.call($popup, element) === false) {
                                module.debug('onHide callback returned false, cancelling popup animation');
                                return;
                            }
                            if (settings.transition && $.fn.transition !== undefined && $module.transition('is supported')) {
                                $popup
                                    .transition({
                                        animation: settings.transition + ' out',
                                        queue: false,
                                        duration: settings.duration,
                                        debug: settings.debug,
                                        verbose: settings.verbose,
                                        onComplete: function () {
                                            module.reset();
                                            callback.call($popup, element);
                                            settings.onHidden.call($popup, element);
                                        }
                                    })
                                ;
                            }
                            else {
                                module.error(error.noTransition);
                            }
                        }
                    },

                    change: {
                        content: function (html) {
                            $popup.html(html);
                        }
                    },

                    get: {
                        html: function () {
                            $module.removeData(metadata.html);
                            return $module.data(metadata.html) || settings.html;
                        },
                        title: function () {
                            $module.removeData(metadata.title);
                            return $module.data(metadata.title) || settings.title;
                        },
                        content: function () {
                            $module.removeData(metadata.content);
                            return $module.data(metadata.content) || settings.content || $module.attr('title');
                        },
                        variation: function () {
                            $module.removeData(metadata.variation);
                            return $module.data(metadata.variation) || settings.variation;
                        },
                        popup: function () {
                            return $popup;
                        },
                        popupOffset: function () {
                            return $popup.offset();
                        },
                        calculations: function () {
                            var
                                $popupOffsetParent = module.get.offsetParent($popup),
                                targetElement = $target[0],
                                isWindow = ($boundary[0] == window),
                                targetPosition = (settings.inline || (settings.popup && settings.movePopup))
                                    ? $target.position()
                                    : $target.offset(),
                                screenPosition = (isWindow)
                                    ? {top: 0, left: 0}
                                    : $boundary.offset(),
                                calculations = {},
                                scroll = (isWindow)
                                    ? {top: $window.scrollTop(), left: $window.scrollLeft()}
                                    : {top: 0, left: 0},
                                screen
                            ;
                            calculations = {
                                // element which is launching popup
                                target: {
                                    element: $target[0],
                                    width: $target.outerWidth(),
                                    height: $target.outerHeight(),
                                    top: targetPosition.top,
                                    left: targetPosition.left,
                                    margin: {}
                                },
                                // popup itself
                                popup: {
                                    width: $popup.outerWidth(),
                                    height: $popup.outerHeight()
                                },
                                // offset container (or 3d context)
                                parent: {
                                    width: $offsetParent.outerWidth(),
                                    height: $offsetParent.outerHeight()
                                },
                                // screen boundaries
                                screen: {
                                    top: screenPosition.top,
                                    left: screenPosition.left,
                                    scroll: {
                                        top: scroll.top,
                                        left: scroll.left
                                    },
                                    width: $boundary.width(),
                                    height: $boundary.height()
                                }
                            };

                            // if popup offset context is not same as target, then adjust calculations
                            if ($popupOffsetParent.get(0) !== $offsetParent.get(0)) {
                                var
                                    popupOffset = $popupOffsetParent.offset()
                                ;
                                calculations.target.top -= popupOffset.top;
                                calculations.target.left -= popupOffset.left;
                                calculations.parent.width = $popupOffsetParent.outerWidth();
                                calculations.parent.height = $popupOffsetParent.outerHeight();
                            }

                            // add in container calcs if fluid
                            if (settings.setFluidWidth && module.is.fluid()) {
                                calculations.container = {
                                    width: $popup.parent().outerWidth()
                                };
                                calculations.popup.width = calculations.container.width;
                            }

                            // add in margins if inline
                            calculations.target.margin.top = (settings.inline)
                                ? parseInt(window.getComputedStyle(targetElement).getPropertyValue('margin-top'), 10)
                                : 0
                            ;
                            calculations.target.margin.left = (settings.inline)
                                ? module.is.rtl()
                                    ? parseInt(window.getComputedStyle(targetElement).getPropertyValue('margin-right'), 10)
                                    : parseInt(window.getComputedStyle(targetElement).getPropertyValue('margin-left'), 10)
                                : 0
                            ;
                            // calculate screen boundaries
                            screen = calculations.screen;
                            calculations.boundary = {
                                top: screen.top + screen.scroll.top,
                                bottom: screen.top + screen.scroll.top + screen.height,
                                left: screen.left + screen.scroll.left,
                                right: screen.left + screen.scroll.left + screen.width
                            };
                            return calculations;
                        },
                        id: function () {
                            return id;
                        },
                        startEvent: function () {
                            if (settings.on == 'hover') {
                                return 'mouseenter';
                            }
                            else if (settings.on == 'focus') {
                                return 'focus';
                            }
                            return false;
                        },
                        scrollEvent: function () {
                            return 'scroll';
                        },
                        endEvent: function () {
                            if (settings.on == 'hover') {
                                return 'mouseleave';
                            }
                            else if (settings.on == 'focus') {
                                return 'blur';
                            }
                            return false;
                        },
                        distanceFromBoundary: function (offset, calculations) {
                            var
                                distanceFromBoundary = {},
                                popup,
                                boundary
                            ;
                            calculations = calculations || module.get.calculations();

                            // shorthand
                            popup = calculations.popup;
                            boundary = calculations.boundary;

                            if (offset) {
                                distanceFromBoundary = {
                                    top: (offset.top - boundary.top),
                                    left: (offset.left - boundary.left),
                                    right: (boundary.right - (offset.left + popup.width)),
                                    bottom: (boundary.bottom - (offset.top + popup.height))
                                };
                                module.verbose('Distance from boundaries determined', offset, distanceFromBoundary);
                            }
                            return distanceFromBoundary;
                        },
                        offsetParent: function ($element) {
                            var
                                element = ($element !== undefined)
                                    ? $element[0]
                                    : $target[0],
                                parentNode = element.parentNode,
                                $node = $(parentNode)
                            ;
                            if (parentNode) {
                                var
                                    is2D = ($node.css('transform') === 'none'),
                                    isStatic = ($node.css('position') === 'static'),
                                    isBody = $node.is('body')
                                ;
                                while (parentNode && !isBody && isStatic && is2D) {
                                    parentNode = parentNode.parentNode;
                                    $node = $(parentNode);
                                    is2D = ($node.css('transform') === 'none');
                                    isStatic = ($node.css('position') === 'static');
                                    isBody = $node.is('body');
                                }
                            }
                            return ($node && $node.length > 0)
                                ? $node
                                : $()
                                ;
                        },
                        positions: function () {
                            return {
                                'top left': false,
                                'top center': false,
                                'top right': false,
                                'bottom left': false,
                                'bottom center': false,
                                'bottom right': false,
                                'left center': false,
                                'right center': false
                            };
                        },
                        nextPosition: function (position) {
                            var
                                positions = position.split(' '),
                                verticalPosition = positions[0],
                                horizontalPosition = positions[1],
                                opposite = {
                                    top: 'bottom',
                                    bottom: 'top',
                                    left: 'right',
                                    right: 'left'
                                },
                                adjacent = {
                                    left: 'center',
                                    center: 'right',
                                    right: 'left'
                                },
                                backup = {
                                    'top left': 'top center',
                                    'top center': 'top right',
                                    'top right': 'right center',
                                    'right center': 'bottom right',
                                    'bottom right': 'bottom center',
                                    'bottom center': 'bottom left',
                                    'bottom left': 'left center',
                                    'left center': 'top left'
                                },
                                adjacentsAvailable = (verticalPosition == 'top' || verticalPosition == 'bottom'),
                                oppositeTried = false,
                                adjacentTried = false,
                                nextPosition = false
                            ;
                            if (!triedPositions) {
                                module.verbose('All available positions available');
                                triedPositions = module.get.positions();
                            }

                            module.debug('Recording last position tried', position);
                            triedPositions[position] = true;

                            if (settings.prefer === 'opposite') {
                                nextPosition = [opposite[verticalPosition], horizontalPosition];
                                nextPosition = nextPosition.join(' ');
                                oppositeTried = (triedPositions[nextPosition] === true);
                                module.debug('Trying opposite strategy', nextPosition);
                            }
                            if ((settings.prefer === 'adjacent') && adjacentsAvailable) {
                                nextPosition = [verticalPosition, adjacent[horizontalPosition]];
                                nextPosition = nextPosition.join(' ');
                                adjacentTried = (triedPositions[nextPosition] === true);
                                module.debug('Trying adjacent strategy', nextPosition);
                            }
                            if (adjacentTried || oppositeTried) {
                                module.debug('Using backup position', nextPosition);
                                nextPosition = backup[position];
                            }
                            return nextPosition;
                        }
                    },

                    set: {
                        position: function (position, calculations) {

                            // exit conditions
                            if ($target.length === 0 || $popup.length === 0) {
                                module.error(error.notFound);
                                return;
                            }
                            var
                                offset,
                                distanceAway,
                                target,
                                popup,
                                parent,
                                positioning,
                                popupOffset,
                                distanceFromBoundary
                            ;

                            calculations = calculations || module.get.calculations();
                            position = position || $module.data(metadata.position) || settings.position;

                            offset = $module.data(metadata.offset) || settings.offset;
                            distanceAway = settings.distanceAway;

                            // shorthand
                            target = calculations.target;
                            popup = calculations.popup;
                            parent = calculations.parent;

                            if (module.should.centerArrow(calculations)) {
                                module.verbose('Adjusting offset to center arrow on small target element');
                                if (position == 'top left' || position == 'bottom left') {
                                    offset += (target.width / 2)
                                    offset -= settings.arrowPixelsFromEdge;
                                }
                                if (position == 'top right' || position == 'bottom right') {
                                    offset -= (target.width / 2)
                                    offset += settings.arrowPixelsFromEdge;
                                }
                            }

                            if (target.width === 0 && target.height === 0 && !module.is.svg(target.element)) {
                                module.debug('Popup target is hidden, no action taken');
                                return false;
                            }

                            if (settings.inline) {
                                module.debug('Adding margin to calculation', target.margin);
                                if (position == 'left center' || position == 'right center') {
                                    offset += target.margin.top;
                                    distanceAway += -target.margin.left;
                                }
                                else if (position == 'top left' || position == 'top center' || position == 'top right') {
                                    offset += target.margin.left;
                                    distanceAway -= target.margin.top;
                                }
                                else {
                                    offset += target.margin.left;
                                    distanceAway += target.margin.top;
                                }
                            }

                            module.debug('Determining popup position from calculations', position, calculations);

                            if (module.is.rtl()) {
                                position = position.replace(/left|right/g, function (match) {
                                    return (match == 'left')
                                        ? 'right'
                                        : 'left'
                                        ;
                                });
                                module.debug('RTL: Popup position updated', position);
                            }

                            // if last attempt use specified last resort position
                            if (searchDepth == settings.maxSearchDepth && typeof settings.lastResort === 'string') {
                                position = settings.lastResort;
                            }

                            switch (position) {
                                case 'top left':
                                    positioning = {
                                        top: 'auto',
                                        bottom: parent.height - target.top + distanceAway,
                                        left: target.left + offset,
                                        right: 'auto'
                                    };
                                    break;
                                case 'top center':
                                    positioning = {
                                        bottom: parent.height - target.top + distanceAway,
                                        left: target.left + (target.width / 2) - (popup.width / 2) + offset,
                                        top: 'auto',
                                        right: 'auto'
                                    };
                                    break;
                                case 'top right':
                                    positioning = {
                                        bottom: parent.height - target.top + distanceAway,
                                        right: parent.width - target.left - target.width - offset,
                                        top: 'auto',
                                        left: 'auto'
                                    };
                                    break;
                                case 'left center':
                                    positioning = {
                                        top: target.top + (target.height / 2) - (popup.height / 2) + offset,
                                        right: parent.width - target.left + distanceAway,
                                        left: 'auto',
                                        bottom: 'auto'
                                    };
                                    break;
                                case 'right center':
                                    positioning = {
                                        top: target.top + (target.height / 2) - (popup.height / 2) + offset,
                                        left: target.left + target.width + distanceAway,
                                        bottom: 'auto',
                                        right: 'auto'
                                    };
                                    break;
                                case 'bottom left':
                                    positioning = {
                                        top: target.top + target.height + distanceAway,
                                        left: target.left + offset,
                                        bottom: 'auto',
                                        right: 'auto'
                                    };
                                    break;
                                case 'bottom center':
                                    positioning = {
                                        top: target.top + target.height + distanceAway,
                                        left: target.left + (target.width / 2) - (popup.width / 2) + offset,
                                        bottom: 'auto',
                                        right: 'auto'
                                    };
                                    break;
                                case 'bottom right':
                                    positioning = {
                                        top: target.top + target.height + distanceAway,
                                        right: parent.width - target.left - target.width - offset,
                                        left: 'auto',
                                        bottom: 'auto'
                                    };
                                    break;
                            }
                            if (positioning === undefined) {
                                module.error(error.invalidPosition, position);
                            }

                            module.debug('Calculated popup positioning values', positioning);

                            // tentatively place on stage
                            $popup
                                .css(positioning)
                                .removeClass(className.position)
                                .addClass(position)
                                .addClass(className.loading)
                            ;

                            popupOffset = module.get.popupOffset();

                            // see if any boundaries are surpassed with this tentative position
                            distanceFromBoundary = module.get.distanceFromBoundary(popupOffset, calculations);

                            if (module.is.offstage(distanceFromBoundary, position)) {
                                module.debug('Position is outside viewport', position);
                                if (searchDepth < settings.maxSearchDepth) {
                                    searchDepth++;
                                    position = module.get.nextPosition(position);
                                    module.debug('Trying new position', position);
                                    return ($popup)
                                        ? module.set.position(position, calculations)
                                        : false
                                        ;
                                }
                                else {
                                    if (settings.lastResort) {
                                        module.debug('No position found, showing with last position');
                                    }
                                    else {
                                        module.debug('Popup could not find a position to display', $popup);
                                        module.error(error.cannotPlace, element);
                                        module.remove.attempts();
                                        module.remove.loading();
                                        module.reset();
                                        settings.onUnplaceable.call($popup, element);
                                        return false;
                                    }
                                }
                            }
                            module.debug('Position is on stage', position);
                            module.remove.attempts();
                            module.remove.loading();
                            if (settings.setFluidWidth && module.is.fluid()) {
                                module.set.fluidWidth(calculations);
                            }
                            return true;
                        },

                        fluidWidth: function (calculations) {
                            calculations = calculations || module.get.calculations();
                            module.debug('Automatically setting element width to parent width', calculations.parent.width);
                            $popup.css('width', calculations.container.width);
                        },

                        variation: function (variation) {
                            variation = variation || module.get.variation();
                            if (variation && module.has.popup()) {
                                module.verbose('Adding variation to popup', variation);
                                $popup.addClass(variation);
                            }
                        },

                        visible: function () {
                            $module.addClass(className.visible);
                        }
                    },

                    remove: {
                        loading: function () {
                            $popup.removeClass(className.loading);
                        },
                        variation: function (variation) {
                            variation = variation || module.get.variation();
                            if (variation) {
                                module.verbose('Removing variation', variation);
                                $popup.removeClass(variation);
                            }
                        },
                        visible: function () {
                            $module.removeClass(className.visible);
                        },
                        attempts: function () {
                            module.verbose('Resetting all searched positions');
                            searchDepth = 0;
                            triedPositions = false;
                        }
                    },

                    bind: {
                        events: function () {
                            module.debug('Binding popup events to module');
                            if (settings.on == 'click') {
                                $module
                                    .on('click' + eventNamespace, module.toggle)
                                ;
                            }
                            if (settings.on == 'hover' && hasTouch) {
                                $module
                                    .on('touchstart' + eventNamespace, module.event.touchstart)
                                ;
                            }
                            if (module.get.startEvent()) {
                                $module
                                    .on(module.get.startEvent() + eventNamespace, module.event.start)
                                    .on(module.get.endEvent() + eventNamespace, module.event.end)
                                ;
                            }
                            if (settings.target) {
                                module.debug('Target set to element', $target);
                            }
                            $window.on('resize' + elementNamespace, module.event.resize);
                        },
                        popup: function () {
                            module.verbose('Allowing hover events on popup to prevent closing');
                            if ($popup && module.has.popup()) {
                                $popup
                                    .on('mouseenter' + eventNamespace, module.event.start)
                                    .on('mouseleave' + eventNamespace, module.event.end)
                                ;
                            }
                        },
                        close: function () {
                            if (settings.hideOnScroll === true || (settings.hideOnScroll == 'auto' && settings.on != 'click')) {
                                module.bind.closeOnScroll();
                            }
                            if (module.is.closable()) {
                                module.bind.clickaway();
                            }
                            else if (settings.on == 'hover' && openedWithTouch) {
                                module.bind.touchClose();
                            }
                        },
                        closeOnScroll: function () {
                            module.verbose('Binding scroll close event to document');
                            $scrollContext
                                .one(module.get.scrollEvent() + elementNamespace, module.event.hideGracefully)
                            ;
                        },
                        touchClose: function () {
                            module.verbose('Binding popup touchclose event to document');
                            $document
                                .on('touchstart' + elementNamespace, function (event) {
                                    module.verbose('Touched away from popup');
                                    module.event.hideGracefully.call(element, event);
                                })
                            ;
                        },
                        clickaway: function () {
                            module.verbose('Binding popup close event to document');
                            $document
                                .on('click' + elementNamespace, function (event) {
                                    module.verbose('Clicked away from popup');
                                    module.event.hideGracefully.call(element, event);
                                })
                            ;
                        }
                    },

                    unbind: {
                        events: function () {
                            $window
                                .off(elementNamespace)
                            ;
                            $module
                                .off(eventNamespace)
                            ;
                        },
                        close: function () {
                            $document
                                .off(elementNamespace)
                            ;
                            $scrollContext
                                .off(elementNamespace)
                            ;
                        },
                    },

                    has: {
                        popup: function () {
                            return ($popup && $popup.length > 0);
                        }
                    },

                    should: {
                        centerArrow: function (calculations) {
                            return !module.is.basic() && calculations.target.width <= (settings.arrowPixelsFromEdge * 2);
                        },
                    },

                    is: {
                        closable: function () {
                            if (settings.closable == 'auto') {
                                if (settings.on == 'hover') {
                                    return false;
                                }
                                return true;
                            }
                            return settings.closable;
                        },
                        offstage: function (distanceFromBoundary, position) {
                            var
                                offstage = []
                            ;
                            // return boundaries that have been surpassed
                            $.each(distanceFromBoundary, function (direction, distance) {
                                if (distance < -settings.jitter) {
                                    module.debug('Position exceeds allowable distance from edge', direction, distance, position);
                                    offstage.push(direction);
                                }
                            });
                            if (offstage.length > 0) {
                                return true;
                            }
                            else {
                                return false;
                            }
                        },
                        svg: function (element) {
                            return module.supports.svg() && (element instanceof SVGGraphicsElement);
                        },
                        basic: function () {
                            return $module.hasClass(className.basic);
                        },
                        active: function () {
                            return $module.hasClass(className.active);
                        },
                        animating: function () {
                            return ($popup !== undefined && $popup.hasClass(className.animating));
                        },
                        fluid: function () {
                            return ($popup !== undefined && $popup.hasClass(className.fluid));
                        },
                        visible: function () {
                            return ($popup !== undefined && $popup.hasClass(className.popupVisible));
                        },
                        dropdown: function () {
                            return $module.hasClass(className.dropdown);
                        },
                        hidden: function () {
                            return !module.is.visible();
                        },
                        rtl: function () {
                            return $module.css('direction') == 'rtl';
                        }
                    },

                    reset: function () {
                        module.remove.visible();
                        if (settings.preserve) {
                            if ($.fn.transition !== undefined) {
                                $popup
                                    .transition('remove transition')
                                ;
                            }
                        }
                        else {
                            module.removePopup();
                        }
                    },

                    setting: function (name, value) {
                        if ($.isPlainObject(name)) {
                            $.extend(true, settings, name);
                        }
                        else if (value !== undefined) {
                            settings[name] = value;
                        }
                        else {
                            return settings[name];
                        }
                    },
                    internal: function (name, value) {
                        if ($.isPlainObject(name)) {
                            $.extend(true, module, name);
                        }
                        else if (value !== undefined) {
                            module[name] = value;
                        }
                        else {
                            return module[name];
                        }
                    },
                    debug: function () {
                        if (!settings.silent && settings.debug) {
                            if (settings.performance) {
                                module.performance.log(arguments);
                            }
                            else {
                                module.debug = Function.prototype.bind.call(console.info, console, settings.name + ':');
                                module.debug.apply(console, arguments);
                            }
                        }
                    },
                    verbose: function () {
                        if (!settings.silent && settings.verbose && settings.debug) {
                            if (settings.performance) {
                                module.performance.log(arguments);
                            }
                            else {
                                module.verbose = Function.prototype.bind.call(console.info, console, settings.name + ':');
                                module.verbose.apply(console, arguments);
                            }
                        }
                    },
                    error: function () {
                        if (!settings.silent) {
                            module.error = Function.prototype.bind.call(console.error, console, settings.name + ':');
                            module.error.apply(console, arguments);
                        }
                    },
                    performance: {
                        log: function (message) {
                            var
                                currentTime,
                                executionTime,
                                previousTime
                            ;
                            if (settings.performance) {
                                currentTime = new Date().getTime();
                                previousTime = time || currentTime;
                                executionTime = currentTime - previousTime;
                                time = currentTime;
                                performance.push({
                                    'Name': message[0],
                                    'Arguments': [].slice.call(message, 1) || '',
                                    'Element': element,
                                    'Execution Time': executionTime
                                });
                            }
                            clearTimeout(module.performance.timer);
                            module.performance.timer = setTimeout(module.performance.display, 500);
                        },
                        display: function () {
                            var
                                title = settings.name + ':',
                                totalTime = 0
                            ;
                            time = false;
                            clearTimeout(module.performance.timer);
                            $.each(performance, function (index, data) {
                                totalTime += data['Execution Time'];
                            });
                            title += ' ' + totalTime + 'ms';
                            if (moduleSelector) {
                                title += ' \'' + moduleSelector + '\'';
                            }
                            if ((console.group !== undefined || console.table !== undefined) && performance.length > 0) {
                                console.groupCollapsed(title);
                                if (console.table) {
                                    console.table(performance);
                                }
                                else {
                                    $.each(performance, function (index, data) {
                                        console.log(data['Name'] + ': ' + data['Execution Time'] + 'ms');
                                    });
                                }
                                console.groupEnd();
                            }
                            performance = [];
                        }
                    },
                    invoke: function (query, passedArguments, context) {
                        var
                            object = instance,
                            maxDepth,
                            found,
                            response
                        ;
                        passedArguments = passedArguments || queryArguments;
                        context = element || context;
                        if (typeof query == 'string' && object !== undefined) {
                            query = query.split(/[\. ]/);
                            maxDepth = query.length - 1;
                            $.each(query, function (depth, value) {
                                var camelCaseValue = (depth != maxDepth)
                                    ? value + query[depth + 1].charAt(0).toUpperCase() + query[depth + 1].slice(1)
                                    : query
                                ;
                                if ($.isPlainObject(object[camelCaseValue]) && (depth != maxDepth)) {
                                    object = object[camelCaseValue];
                                }
                                else if (object[camelCaseValue] !== undefined) {
                                    found = object[camelCaseValue];
                                    return false;
                                }
                                else if ($.isPlainObject(object[value]) && (depth != maxDepth)) {
                                    object = object[value];
                                }
                                else if (object[value] !== undefined) {
                                    found = object[value];
                                    return false;
                                }
                                else {
                                    return false;
                                }
                            });
                        }
                        if ($.isFunction(found)) {
                            response = found.apply(context, passedArguments);
                        }
                        else if (found !== undefined) {
                            response = found;
                        }
                        if ($.isArray(returnedValue)) {
                            returnedValue.push(response);
                        }
                        else if (returnedValue !== undefined) {
                            returnedValue = [returnedValue, response];
                        }
                        else if (response !== undefined) {
                            returnedValue = response;
                        }
                        return found;
                    }
                };

                if (methodInvoked) {
                    if (instance === undefined) {
                        module.initialize();
                    }
                    module.invoke(query);
                }
                else {
                    if (instance !== undefined) {
                        instance.invoke('destroy');
                    }
                    module.initialize();
                }
            })
        ;

        return (returnedValue !== undefined)
            ? returnedValue
            : this
            ;
    };

    $.fn.popup.settings = {

        name: 'Popup',

        // module settings
        silent: false,
        debug: false,
        verbose: false,
        performance: true,
        namespace: 'popup',

        // whether it should use dom mutation observers
        observeChanges: true,

        // callback only when element added to dom
        onCreate: function () {
        },

        // callback before element removed from dom
        onRemove: function () {
        },

        // callback before show animation
        onShow: function () {
        },

        // callback after show animation
        onVisible: function () {
        },

        // callback before hide animation
        onHide: function () {
        },

        // callback when popup cannot be positioned in visible screen
        onUnplaceable: function () {
        },

        // callback after hide animation
        onHidden: function () {
        },

        // when to show popup
        on: 'hover',

        // element to use to determine if popup is out of boundary
        boundary: window,

        // whether to add touchstart events when using hover
        addTouchEvents: true,

        // default position relative to element
        position: 'top left',

        // name of variation to use
        variation: '',

        // whether popup should be moved to context
        movePopup: true,

        // element which popup should be relative to
        target: false,

        // jq selector or element that should be used as popup
        popup: false,

        // popup should remain inline next to activator
        inline: false,

        // popup should be removed from page on hide
        preserve: false,

        // popup should not close when being hovered on
        hoverable: false,

        // explicitly set content
        content: false,

        // explicitly set html
        html: false,

        // explicitly set title
        title: false,

        // whether automatically close on clickaway when on click
        closable: true,

        // automatically hide on scroll
        hideOnScroll: 'auto',

        // hide other popups on show
        exclusive: false,

        // context to attach popups
        context: 'body',

        // context for binding scroll events
        scrollContext: window,

        // position to prefer when calculating new position
        prefer: 'opposite',

        // specify position to appear even if it doesn't fit
        lastResort: false,

        // number of pixels from edge of popup to pointing arrow center (used from centering)
        arrowPixelsFromEdge: 20,

        // delay used to prevent accidental refiring of animations due to user error
        delay: {
            show: 50,
            hide: 70
        },

        // whether fluid variation should assign width explicitly
        setFluidWidth: true,

        // transition settings
        duration: 200,
        transition: 'scale',

        // distance away from activating element in px
        distanceAway: 0,

        // number of pixels an element is allowed to be "offstage" for a position to be chosen (allows for rounding)
        jitter: 2,

        // offset on aligning axis from calculated position
        offset: 0,

        // maximum times to look for a position before failing (9 positions total)
        maxSearchDepth: 15,

        error: {
            invalidPosition: 'The position you specified is not a valid position',
            cannotPlace: 'Popup does not fit within the boundaries of the viewport',
            method: 'The method you called is not defined.',
            noTransition: 'This module requires ui transitions <https://github.com/Semantic-Org/UI-Transition>',
            notFound: 'The target or popup you specified does not exist on the page'
        },

        metadata: {
            activator: 'activator',
            content: 'content',
            html: 'html',
            offset: 'offset',
            position: 'position',
            title: 'title',
            variation: 'variation'
        },

        className: {
            active: 'active',
            basic: 'basic',
            animating: 'animating',
            dropdown: 'dropdown',
            fluid: 'fluid',
            loading: 'loading',
            popup: 'ui popup',
            position: 'top left center bottom right',
            visible: 'visible',
            popupVisible: 'visible'
        },

        selector: {
            popup: '.ui.popup'
        },

        templates: {
            escape: function (string) {
                var
                    badChars = /[&<>"'`]/g,
                    shouldEscape = /[&<>"'`]/,
                    escape = {
                        "&": "&amp;",
                        "<": "&lt;",
                        ">": "&gt;",
                        '"': "&quot;",
                        "'": "&#x27;",
                        "`": "&#x60;"
                    },
                    escapedChar = function (chr) {
                        return escape[chr];
                    }
                ;
                if (shouldEscape.test(string)) {
                    return string.replace(badChars, escapedChar);
                }
                return string;
            },
            popup: function (text) {
                var
                    html = '',
                    escape = $.fn.popup.settings.templates.escape
                ;
                if (typeof text !== undefined) {
                    if (typeof text.title !== undefined && text.title) {
                        text.title = escape(text.title);
                        html += '<div class="header">' + text.title + '</div>';
                    }
                    if (typeof text.content !== undefined && text.content) {
                        text.content = escape(text.content);
                        html += '<div class="content">' + text.content + '</div>';
                    }
                }
                return html;
            }
        }

    };


})(jQuery, window, document);
